1 | Creswell, J.W. (2009) Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. SAGE Publications, Los Angeles. |
2 | Creswell, J.W. (2008) Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research. PEARSON Merrill Prentice Hall, New Jersey |
3 | Holcomb, Z.C. (2009) SPSS Basics: Techniques for a First Course in Statistics. Pyrczak Publishing. California. |
4 | Kalaycı, Ş. (2010) SPSS Uygulamalı Çok Değişkenli İstatistik Teknikleri. Asil yayın Dağıtım Ltd. Şti. Ankara. |